You get it by participating in Turf Wars IF your Guild holds tiles after the final clash of the day. The amount of Contribution you earn is determined by three factors.

1) Your Guild has to own one or more tiles at the end of the final Clash of the day (the last Clash of the week awards double). The more tiles the Guild holds, the more Contribution (and other winnings) that goes into the 'pot' to be divided among the people that participated in the War.

2) The lower the Tier (Tier I being the best), the higher the rewards. Each tile gives substantially more in rewards as your Guild progresses through the Tiers.

3) The more power you spend (the Troop Strength applied including the Elixir boost) as compared to the rest of your Guild Members, the more Contribution you earn compared to the rest of the Guild members.

4) You also receive the Contribution just for being a part of a Guild who participate in the Turf Wars. You get it every day by mail. The amount depends on a Tier of the war.

Also sometimes referred to as Boost (Gold Dust is also sometimes referred to as Boost which can make things confusing). It is worthless to you until you join a guild that participates in Turf Wars (that’s where guilds battle each other to earn heroes and other good stuff). Then … you will likely never have enough of it.

What is it good for?

It gives an increase to your personal strength on that tile each time you use it. While you can use it more than once on a tile, the cost goes up ... quickly.

%

Cost

Total

20%

30

30

40%

70

100

70%

100

200

100%

150

350

130%

250

600

160%

400

1000

190%

600

1600

230%

700

2300

270%

850

3150

310%

850

4000

350%

850

4850

400%

850

5700

450%

850

6550

500%

850

7400

550%

850

8250

610%

850

9100

670%

900

10000

730%

1000

11000

790%

2000

13000

860%

2000

15000

930%

2000

17000

1000%

2000

19000

1080%

3000

22000

1160%

3000

25000

1240%

5000

30000

1330%

7000

37000

1420%

9000

46000

1510%

11000

57000

1600%

13000

70000

1700%

15000

85000

1800%

20000

105000

1900%

25000

130000

2000%

30000

160000

Where do you get it?

You can buy it in the Shop. It is often available in the Dark Shop and the Journey Shop. You also get it as a bonus when you or your fellow guildmates buy gems. Lastly, you will occasionally get a little for winning the Brawl.